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Table 2 Average pH and DP0 values for the groups of acidic and non-acidic books for the C and NC collection

From: Non-destructive collection survey of the historical Classense Library. Part II: Conservation scenarios

  C collection NC collection
Non-acidic Acidica Non-acidic Acidic
Average pH 6.8 5 6.4 5.4
Average DP0 1550 600 1640 1350
Proportion (%) 28 72 35 65
  1. aBooks with iron gall ink considered as acidic books